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FR2621437B1 - ACTIVE DIPOLE TELEPHONE LINE PROTECTION DEVICE - Google Patents

ACTIVE DIPOLE TELEPHONE LINE PROTECTION DEVICE

Info

Publication number
FR2621437B1
FR2621437B1 FR8713579A FR8713579A FR2621437B1 FR 2621437 B1 FR2621437 B1 FR 2621437B1 FR 8713579 A FR8713579 A FR 8713579A FR 8713579 A FR8713579 A FR 8713579A FR 2621437 B1 FR2621437 B1 FR 2621437B1
Authority
FR
France
Prior art keywords
protection device
telephone line
line protection
active dipole
dipole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
FR8713579A
Other languages
French (fr)
Other versions
FR2621437A1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR8713579A priority Critical patent/FR2621437B1/en
Priority to US07/250,907 priority patent/US4885768A/en
Priority to EP88402463A priority patent/EP0310512A1/en
Publication of FR2621437A1 publication Critical patent/FR2621437A1/en
Application granted granted Critical
Publication of FR2621437B1 publication Critical patent/FR2621437B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/66—Substation equipment, e.g. for use by subscribers with means for preventing unauthorised or fraudulent calling
    • H04M1/667—Preventing unauthorised calls from a telephone set
    • H04M1/67—Preventing unauthorised calls from a telephone set by electronic means
    • H04M1/673—Preventing unauthorised calls from a telephone set by electronic means the user being required to key in a code

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Signal Processing (AREA)
  • Telephonic Communication Services (AREA)
FR8713579A 1987-10-01 1987-10-01 ACTIVE DIPOLE TELEPHONE LINE PROTECTION DEVICE Expired - Lifetime FR2621437B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR8713579A FR2621437B1 (en) 1987-10-01 1987-10-01 ACTIVE DIPOLE TELEPHONE LINE PROTECTION DEVICE
US07/250,907 US4885768A (en) 1987-10-01 1988-09-29 Active dipole telephone line protection device
EP88402463A EP0310512A1 (en) 1987-10-01 1988-09-29 Protection device for a telephone line with an active dipole

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8713579A FR2621437B1 (en) 1987-10-01 1987-10-01 ACTIVE DIPOLE TELEPHONE LINE PROTECTION DEVICE

Publications (2)

Publication Number Publication Date
FR2621437A1 FR2621437A1 (en) 1989-04-07
FR2621437B1 true FR2621437B1 (en) 1990-01-05

Family

ID=9355421

Family Applications (1)

Application Number Title Priority Date Filing Date
FR8713579A Expired - Lifetime FR2621437B1 (en) 1987-10-01 1987-10-01 ACTIVE DIPOLE TELEPHONE LINE PROTECTION DEVICE

Country Status (3)

Country Link
US (1) US4885768A (en)
EP (1) EP0310512A1 (en)
FR (1) FR2621437B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5003586A (en) * 1989-11-02 1991-03-26 Siecor Corporation Dial tone interrupt device
GB9226779D0 (en) * 1992-12-23 1993-02-17 Plessey Telecomm Customer identity validation
US5559874A (en) * 1995-03-13 1996-09-24 Panosh; Richard Telephone service protection device
US5926529A (en) * 1995-03-17 1999-07-20 U.S. Philips Corporation Communication system for detecting an unauthorized intruder terminal unit
CA2279684C (en) * 1999-08-05 2007-05-15 Vtech Communications, Ltd. Method and apparatus for telephone call fraud detection and prevention

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH628762A5 (en) * 1978-06-12 1982-03-15 Sodeco Compteurs De Geneve CIRCUIT ARRANGEMENT FOR TELEPHONE PARTICIPANTS FOR DETECTING DIALING PULSES.
IT1207459B (en) * 1983-03-21 1989-05-25 Italtel Spa ELECTRONIC PADLOCK FOR USER TELEPHONE LINE.
DE3617973C1 (en) * 1986-05-28 1987-07-09 Neumann Elektronik Gmbh Dialling restriction for a telephone device in telephone systems with pulse or frequency dialling

Also Published As

Publication number Publication date
FR2621437A1 (en) 1989-04-07
US4885768A (en) 1989-12-05
EP0310512A1 (en) 1989-04-05

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Legal Events

Date Code Title Description
TP Transmission of property
ST Notification of lapse